eosfun Offline Upload & Sell: Off
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If you really need 500mm and you van live with the low speed, the Sigma APO 50-500mm is the way to go. The 150-500 isn't very interesting, it adds OS, but what's the use of it if optical performance is so so. The 50-500 APO is a way better lens. Sharp, nice colours and a great MFD, which makes the lense very capable for close focus/semi-macro photography. The 100-400L from Canon has always been the greatest competitor for Sigma's 50-500, because of the additional IS. But the lack of the reach until 500 that Sigma's 50-500 offered was the trade off. A converter is not the best solution to get that extra reach. Optical performance goes down, AF is slower or disabled,and you lose another stop of speed, but for occasional applications this can be a workaround of course. So in the end in comes down to the question wether you really need the 500 reach. If so, go for the Sigma 50-500. It's a bit slow, it's big, but for everything else it's one of Sigma's best telezoom lenses IQ-wise in their portfolio. With Canon's 100-400L you can't go wrong either, but you'll have to live with a little less reach. Just forget about that 150-500, it's not worth it. Have EOSfun
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